Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a724277c6167c2b…

MALICIOUS

PDF

33.9 KB Created: 2020-06-06 06:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff814a48fe3715e31ab64a2a47935b24 SHA-1: c9c0e8be99afaa38f47deee0b9cc8dbdcdfe3554 SHA-256: 5a724277c6167c2b663c129de6699bfd31597b297e02c77fa6f3383b5ef56157
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary purpose appears to be directing users to a vast collection of other PDF files hosted across numerous domains. While no scripts were directly extracted, the extensive linking strategy suggests an attempt to manipulate search engine results or distribute malicious content indirectly. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://guysurfaces.com/uploads/1/3/0/6/130621838/130621838.html#azza+mouse+scroll+wheel+broken
    • http://hostmaster.idoweddingdvdsni.com/uploads/1/3/0/2/130272606/4164023.pdf
    • http://vegasvalleycpr.com/uploads/1/3/0/5/130539072/vaporevo-fawagirufedu-juwavuv-bupiturub.pdf
    • http://loveprettything.com/uploads/1/3/1/4/131409597/288441a.pdf
    • http://gnofeg.com/uploads/1/3/0/4/130489563/pogidukamote.pdf
    • http://crowsfeet.org/uploads/1/3/0/5/130588732/roboze.pdf
    • http://shopinhercloset.com/uploads/1/3/0/6/130604708/5789618.pdf
    • http://invibecreativeartstherapy.com/uploads/1/3/1/0/131071308/7928722.pdf
    • http://rxsconvergence.com/uploads/1/3/0/3/130379824/nunutuzojo-temivuv-fufojadi-wunibumuk.pdf
    • http://viningsvintage.info/uploads/1/3/0/8/130874667/sakid.pdf
    • http://guysurfaces.com/uploads/1/3/0/6/130621838/terms.html
    • http://guysurfaces.com/uploads/1/3/0/6/130621838/dmca.html
    • http://guysurfaces.com/uploads/1/3/0/6/130621838/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tamofudugeso.files.wordpress.com/2020/06/32547888216.pdf
    • https://nemujatisale.files.wordpress.com/2020/06/90861892983.pdf
    • https://kosimebumoni.files.wordpress.com/2020/06/53057885794.pdf
    • https://mejasimar844435924.files.wordpress.com/2020/06/17694623265.pdf
    • https://karulirus.files.wordpress.com/2020/06/51968085121.pdf
    • https://gokasinowaf.files.wordpress.com/2020/06/62634780655.pdf
    • https://wibividi.files.wordpress.com/2020/06/60651219648.pdf
    • https://pivakira.files.wordpress.com/2020/06/19700494895.pdf
    • https://xewefevoba.files.wordpress.com/2020/06/motuxunofotugi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000596d.bin
7d58bdc09fb797f8a8b566f80d38d7454faeb1b173ce3b9fe14d03b3f84a0c6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x596D 9968 bytes